Clock



{No Model.)

D. T. GARCIA.

CLOCK.

No. 349,878. Patented Sept. 28, 1886.

WITNESSES IN'VBNTOR M, Jmwb 4 J BY VUuM ATTORNEYS;

UNITED STATES PATENT OEEicE.

DOMINGO TORRES GARCIA, OF G'UADALAJARA, MEXICO.

CLOCK.

SPECIFICATION forming part of Letters Patent No. 349,878, datedSeptember 28, 1886.

Application filed February 13, 1886. Serial No. 191,806. (No model.)

To all whom it may concern:

Be it known that I, DOMINGO ToRREs GAR- CIA, of Guadalajara, Mexico,have invented a new and Improved Differential Clock, of which thefollowing is a full, clear, and eXact description.

The object of my invention is to provide a new and improved clock ortime-keeping mechanism, which is constructed with very few parts,indicates the time very accurately, and is not apt to get out of order.

The invention consists in the construction and combination of parts anddetails, as will be fully described and set forth hereinafter, andpointed out particularly in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is a face View of the mechanism of my improved clock, the outerfixed dial or ring and the outer toothed wheel being removed. Fig. 2 isa cross-sectional view of the complete mechanism, and Fig. 3 is a faceview of the same.

The construction of the clock is based upon the principle ofdifferentialgearing, which has been applied in the manner to be described.

Theanchor escapement orpalletAis mounted on the shaft A, pivoted in theframe B of the clock in the usual manner, and provided with adownwardly-projecting arm, 0, forked at its lower end at O, to receivethe pendulumrod D, which is provided at its lower end with an ordinaryadjustable bob or weight, D. The pendulum-rod D, which may be of anypreferred style, material, or construction, is suspended from a pivotmounted in a bearing, D attached to the frame of the clock; or it may behung in any other suitable manner. On a spindle or arbor, E, journaledin a suitable hearing attached to the frame of the clock, is mountedapinion, F, which engages with a cogwheel, G, journaled in suitablesupports and carrying a drum or barrel, H, and on the drum a cord, wire,or cat-gut, J, is secured, having a weight, K, attached to its free end.All these parts are of ordinary construction, and it is evident that anordinary cloclrspring may be used in lieu of the weight and cord.

On the spindle or arbor E the two toothed wheels L and M are mounted,the innerwheel, L, being mounted rigidly, and the outer wheel, M, beingprovided with a sleeve mounted ratherloosely on the spindle E, and bothwheels L and M are engaged by the anchor or pallet A. The inner wheel,L, is provided with a few less teeth than the wheel M, as and for thepurpose hereinafter described, and on the face of the inner wheel, L, isproduced a circular scale divided into twelve equal parts, and each ofsaid divisions is subdivided into twelve equal parts, so that the innerwheel, L, is dividedinto one hundred and forty-four parts,the twelvelarger divisions representing the twelve hours, and each hour beingdivided into twelve parts, each of which represents five minutes. Theouter wheel, M, is cut out and provided with spokes, so as to permitinspection of the face of the inner wheel, L, and is also provided witha pointer, T, which moves over the circular scale on the inner wheel, L.The outer wheel, M, is also provided on its periphery with a circularscale divided into five parts, each indicating a minute, and each inturn subdivided into sixty parts, making three hundred divisions in all.

WVith the division on the outer wheel, M, a pointer or index, R, isarranged to register, said pointer being formed or provided on the inneredge of the circular ring S, attached to the frame of the clock andsurrounding the outer wheel, M, though placed slightly outward from thesame.

The operation is as follows: The weight K, acting on the drum, causesthe revolution of the cog-wheel G, whereby the pinion F and its spindleor arbor E are revolved, carrying with them the inner toothed wheel, L,the rotation of which is controlled by the anchorpallet A. The action ofthe toothed wheel L on the pallet A causes a swinging of the pendulum,and at each beat of the same a tooth of each toothed wheel L and M isreleased. Let us suppose that the inner wheel, L, has two hundred andeighty-eight teeth and the outer wheel, M, two hundred and ninety teeth.Then, by the time the wheel L has made a revolution M will havecompleted its revolution less twoteetluor four beats. Then, if, forexample, the pendulum is adjusted to make two oscillations, or two beatsof the pendulum, in

' thirty twenty-ninths of a second, the outer wheel will makea completerevolution in thirty twentyninths times two hundred and ninety, or threehundred seconds, or five minutes, as will be indicated by its change ofposition with respect to the fixed pointer R. The inner wheel, L, willcomplete a revolution in thirty twenty-ninths times two hundred andeightyeight seconds, or one hundred and forty-four twenty-ninthsminutes. At the end" of one hour from twelve oclock the wheel M willhave made twelve revolutions, while the wheel L will have made twelveone-twelfths revolutions, so that the pointer T on the wheel M willpoint to l on the wheel L, thus indicating one oclock, and so on. Thefive-minute fractions ofthe hour will also be indicated by the pointer Tpointing to the small divisions on the wheel The minutes and secondswill be indicated 7 by the fixed pointer R pointing to the divisions onthe scale on the outer wheel, M. Many other combinations of numbers maybe used with equal advantage.

By the differential mechanism the long divisions of time are accuratelyindicated without the use of the usual multiplyingt-rain.

I herein shown and described.

2. The combination,with a clock mechanism, of two toothed wheels, ofwhich one has one or more teeth more than the other, and of anescapement anchor lever or pallet engaging with the teeth of bothwheels, the Wheel having the smaller number of teeth being mountedrigidly on a spindle or arbor, and the wheel having thelarger number ofteeth being mounted loosely on said spindle or arbor, substan- 5o tiallyas herein shown and described.

3. The combination, with a cog-wheel, of a weight and cord or spring forrevolving the same, a pinion engaging with said cog-wheel and mounted ona shaft, two toothed wheels, one of which is mounted rigidly and theother loosely on the pinion-shaft, the loose wheel having one or moreteeth morein its rim than the fixed wheel, and of an escapement anchorlever or pallet engaging with the teeth of both wheels, substantially asherein shown and described. 4. The combination, with a clock workmechanism, of two toothed wheels mounted on the same shaft, one beingfixed and the other loose, the fixed wheel having less teeth than theloose wheel, and an escapement anchor pallet or lever engaging with bothwheels, the loose escapement'wheel having part of its face cut out and acircularscale formed around the opening, and the fixed wheel with thesmaller number of teeth having a circular scale produced on its face,substantially as herein shown and described.

5. The combination, with a clock -.work mechanism, of two toothed wheelsmounted on the same shaft, one being fixed and the other loose, thefixed wheel having fewer teeth than the loose wheel, an esoapementpallet anchor or lever engaging the teeth of both wheels, the frontloose wheel provided with the larger number of teeth having part of itsface cutout to form an opening through which the rear wheel having thesmaller number of teeth shows, a pointer formed on the front loose wheelhaving the larger number of teeth and projecting over a scale on theface of the inner fixed wheel having the smaller number of teeth, andofa casing or frame havingapointerprojecting over the scale formed onthe face 90 of the front loose wheel with the larger number ofteeth,substantially as herein shown and described.

DOMINGO TORRES GARCIA.

WVitnesses:

N IOOLEIS PUGA, ANTONIO ARRONIZ.

